/*
 * Copyright (C) 2013 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.momo.dev.l58tool;

import android.app.Service;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothGatt;
import android.bluetooth.BluetoothGattCallback;
import android.bluetooth.BluetoothGattCharacteristic;
import android.bluetooth.BluetoothGattDescriptor;
import android.bluetooth.BluetoothGattService;
import android.bluetooth.BluetoothManager;
import android.bluetooth.BluetoothProfile;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Binder;
import android.os.Bundle;
import android.os.IBinder;
import android.util.Log;

import java.io.Serializable;
import java.util.List;
import java.util.UUID;

/**
 * Service for managing connection and data communication with a GATT server hosted on a
 * given Bluetooth LE device.
 */
public class BluetoothLeService extends Service {
    public final static String TAG = BluetoothLeService.class.getSimpleName();

    public static String HandleCMD = "HandleCommand";
    public static String HandleData = "HandleCommand.Data";
    public static String HandleDeviceAddress = "HandleCommand.DeviceAddress";

    public enum HandleCommand {
        COMMAND_DUMMY("COMMAND_DUMMY", 0),
        NORDIC_BLE_CONNECT("NORDIC_BLE_CONNECT", 1),
        NORDIC_BLE_DISCONNECT("NORDIC_BLE_DISCONNECT", 2),
        NUS_READ_CHARACTERISTIC("NUS_READ_CHARACTERISTIC", 3),
        NUS_WRITE_CHARACTERISTIC("NUS_WRITE_CHARACTERISTIC", 4),
        NUS_TX_SET_NOTIFICATION("NUS_TX_SET_NOTIFICATION", 5);

        // 成员变量
        private String command;
        private int index;

        // 构造方法
        private HandleCommand(String command, int index) {
            this.command = command;
            this.index = index;
        }

        // 普通方法
        public static HandleCommand getHandleCommand(int index) {
            for (HandleCommand hc : HandleCommand.values()) {
                if (hc.getIndex() == index) {
                    return hc;
                }
            }
            return null;
        }

        public static HandleCommand getHandleCommand(String command) {
            for (HandleCommand hc : HandleCommand.values()) {
                if (hc.getCommand() == command) {
                    return hc;
                }
            }
            return null;
        }

        public static int getHandleCommandIndex(String command) {
            for (HandleCommand hc : HandleCommand.values()) {
                if (hc.getCommand() == command) {
                    return hc.index;
                }
            }
            return 0;
        }

        // get set 方法
        public String getCommand() {
            return command;
        }

        public void setCommand(String command) {
            this.command = command;
        }

        public int getIndex() {
            return index;
        }

        public void setIndex(int index) {
            this.index = index;
        }
    }

    private BluetoothManager mBluetoothManager;
    private BluetoothAdapter mBluetoothAdapter;
    private String mBluetoothDeviceAddress;
    private BluetoothGatt mBluetoothGatt;
    private int mConnectionState = STATE_DISCONNECTED;

    private static final int STATE_DISCONNECTED = 0;
    private static final int STATE_CONNECTING = 1;
    private static final int STATE_CONNECTED = 2;

    public final static String ACTION_GATT_CONNECTED =
            "com.example.bluetooth.le.ACTION_GATT_CONNECTED";
    public final static String ACTION_GATT_DISCONNECTED =
            "com.example.bluetooth.le.ACTION_GATT_DISCONNECTED";
    public final static String ACTION_GATT_SERVICES_DISCOVERED =
            "com.example.bluetooth.le.ACTION_GATT_SERVICES_DISCOVERED";
    public final static String ACTION_DATA_AVAILABLE =
            "com.example.bluetooth.le.ACTION_DATA_AVAILABLE";
    public final static String ACTION_GATT_HANDLE =
            "com.example.bluetooth.le.ACTION_GATT_HANDLE";
    public final static String ACTION_GATT_CHARACTERISTIC_NOT_FOUND =
            "com.example.bluetooth.le.ACTION_GATT_CHARACTERISTIC_NOT_FOUND";
    public final static String ACTION_NUS_INITIALIZED =
            "com.example.bluetooth.le.ACTION_NUS_INITIALIZED";
    public static final UUID NUS_SERVICE_UUID = UUID.fromString("6e400001-b5a3-f393-e0a9-e50e24dcca9e");
    public static final UUID RX_CHAR_UUID = UUID.fromString("6e400002-b5a3-f393-e0a9-e50e24dcca9e");
    public static final UUID TX_CHAR_UUID = UUID.fromString("6e400003-b5a3-f393-e0a9-e50e24dcca9e");
    public static String CLIENT_CHARACTERISTIC_CONFIG = "00002902-0000-1000-8000-00805f9b34fb";


    Intent GattCommand = new Intent(BluetoothLeService.ACTION_GATT_HANDLE);

    // Implements callback methods for GATT events that the app cares about.  For example,
    // connection change and services discovered.
    private final BluetoothGattCallback mGattCallback = new BluetoothGattCallback() {
        @Override
        public void onConnectionStateChange(BluetoothGatt gatt, int status, int newState) {
            String intentAction;
            if (newState == BluetoothProfile.STATE_CONNECTED) {
                intentAction = ACTION_GATT_CONNECTED;
                mConnectionState = STATE_CONNECTED;
                broadcastUpdate(intentAction);
                Log.i(TAG, "Connected to GATT server.");
                // Attempts to discover services after successful connection.
                Log.i(TAG, "Attempting to start service discovery:" +
                        mBluetoothGatt.discoverServices());

            } else if (newState == BluetoothProfile.STATE_DISCONNECTED) {
                intentAction = ACTION_GATT_DISCONNECTED;
                mConnectionState = STATE_DISCONNECTED;
                Log.i(TAG, "Disconnected from GATT server.");
                broadcastUpdate(intentAction);
            }
        }

        @Override
        public void onServicesDiscovered(BluetoothGatt gatt, int status) {
            if (status == BluetoothGatt.GATT_SUCCESS) {
                broadcastUpdate(ACTION_GATT_SERVICES_DISCOVERED);
            } else {
                Log.w(TAG, "onServicesDiscovered received: " + status);
            }
        }

        @Override
        public void onCharacteristicRead(BluetoothGatt gatt,
                                         BluetoothGattCharacteristic characteristic,
                                         int status) {
            if (status == BluetoothGatt.GATT_SUCCESS) {
                broadcastUpdate(ACTION_DATA_AVAILABLE, characteristic);
            }
        }

        @Override
        public void onCharacteristicWrite(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, int status) {
            Log.i(TAG, "onCharacteristicWrite status:" + String.valueOf(status));
            super.onCharacteristicWrite(gatt, characteristic, status);
        }

        @Override
        public void onCharacteristicChanged(BluetoothGatt gatt,
                                            BluetoothGattCharacteristic characteristic) {
            broadcastUpdate(ACTION_DATA_AVAILABLE, characteristic);
            Log.i(TAG, "onCharacteristicChanged");
        }
    };

    @Override
    public void onCreate() {
        super.onCreate();
        Log.i(TAG, "BluetoothLeService onCreate");
        registerReceiver(MyReceiver, MyIntentFilter());
    }

    private void broadcastUpdate(final String action) {
        final Intent intent = new Intent(action);
        sendBroadcast(intent);
    }

    private void broadcastUpdate(final String action,
                                 final BluetoothGattCharacteristic characteristic) {
        final Intent intent = new Intent(action);

        // This is special handling for the Heart Rate Measurement profile.  Data parsing is
        // carried out as per profile specifications:
        // http://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.heart_rate_measurement.xml

        // For all other profiles, writes the data formatted in HEX.
        final byte[] data = characteristic.getValue();
        if (data != null && data.length > 0) {
//            final StringBuilder stringBuilder = new StringBuilder(data.length);
//            for(byte byteChar : data)
//                stringBuilder.append(String.format("%02X ", byteChar));
//            intent.putExtra(HandleData, "[ASC]:"+new String(data) + "\n" +"[HEX]:"+stringBuilder.toString()+"\n");
            intent.putExtra(HandleData, data);

        }
        sendBroadcast(intent);
    }

    public class LocalBinder extends Binder {
        BluetoothLeService getService() {
            return BluetoothLeService.this;
        }
    }

    @Override
    public IBinder onBind(Intent intent) {
        Log.i(TAG, "BluetoothLeService onbind");
        return mBinder;
    }

    @Override
    public boolean onUnbind(Intent intent) {
        // After using a given device, you should make sure that BluetoothGatt.close() is called
        // such that resources are cleaned up properly.  In this particular example, close() is
        // invoked when the UI is disconnected from the Service.
        Log.i(TAG, "BluetoothLeService onUnbind");
        //close();
        return super.onUnbind(intent);
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        Log.i(TAG, "BluetoothLeService onDestroy");
    }

    @Override
    public void onStart(Intent intent, int startId) {
        super.onStart(intent, startId);
        Log.i(TAG, "BluetoothLeService onStart");
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        Log.i(TAG, "BluetoothLeService onStartCommand");
        GattCommand.putExtra("status", 30);
        sendBroadcast(GattCommand);
        return super.onStartCommand(intent, flags, startId);
    }

    private final IBinder mBinder = new LocalBinder();

    /**
     * Initializes a reference to the local Bluetooth adapter.
     *
     * @return Return true if the initialization is successful.
     */
    public boolean initialize() {
        // For API level 18 and above, get a reference to BluetoothAdapter through
        // BluetoothManager.
        if (mBluetoothManager == null) {
            mBluetoothManager = (BluetoothManager) getSystemService(Context.BLUETOOTH_SERVICE);
            if (mBluetoothManager == null) {
                Log.e(TAG, "Unable to initialize BluetoothManager.");
                return false;
            }
        }

        mBluetoothAdapter = mBluetoothManager.getAdapter();
        if (mBluetoothAdapter == null) {
            Log.e(TAG, "Unable to obtain a BluetoothAdapter.");
            return false;
        }

        return true;
    }

    /**
     * Connects to the GATT server hosted on the Bluetooth LE device.
     *
     * @param address The device address of the destination device.
     * @return Return true if the connection is initiated successfully. The connection result
     * is reported asynchronously through the
     * {@code BluetoothGattCallback#onConnectionStateChange(android.bluetooth.BluetoothGatt, int, int)}
     * callback.
     */
    public boolean connect(final String address) {
        if (mBluetoothAdapter == null || address == null) {
            Log.w(TAG, "BluetoothAdapter not initialized or unspecified address.");
            return false;
        }

        // Previously connected device.  Try to reconnect.
        if (mBluetoothDeviceAddress != null && address.equals(mBluetoothDeviceAddress)
                && mBluetoothGatt != null) {
            Log.d(TAG, "Trying to use an existing mBluetoothGatt for connection.");
            if (mBluetoothGatt.connect()) {
                mConnectionState = STATE_CONNECTING;
                return true;
            } else {
                return false;
            }
        }

        final BluetoothDevice device = mBluetoothAdapter.getRemoteDevice(address);
        if (device == null) {
            Log.w(TAG, "Device not found.  Unable to connect.");
            return false;
        }
        // We want to directly connect to the device, so we are setting the autoConnect
        // parameter to false.
        mBluetoothGatt = device.connectGatt(this, false, mGattCallback);
        Log.d(TAG, "Trying to create a new connection.");
        mBluetoothDeviceAddress = address;
        mConnectionState = STATE_CONNECTING;
        return true;
    }

    /**
     * Disconnects an existing connection or cancel a pending connection. The disconnection result
     * is reported asynchronously through the
     * {@code BluetoothGattCallback#onConnectionStateChange(android.bluetooth.BluetoothGatt, int, int)}
     * callback.
     */
    public void disconnect() {
        if (mBluetoothAdapter == null || mBluetoothGatt == null) {
            Log.w(TAG, "BluetoothAdapter not initialized");
            return;
        }
        mBluetoothGatt.disconnect();
    }

    /**
     * After using a given BLE device, the app must call this method to ensure resources are
     * released properly.
     */
    public void close() {
        if (mBluetoothGatt == null) {
            return;
        }
        mBluetoothGatt.close();
        mBluetoothGatt = null;
    }

    /**
     * Request a read on a given {@code BluetoothGattCharacteristic}. The read result is reported
     * asynchronously through the {@code BluetoothGattCallback#onCharacteristicRead(android.bluetooth.BluetoothGatt, android.bluetooth.BluetoothGattCharacteristic, int)}
     * callback.
     *
     * @param characteristic The characteristic to read from.
     */
    public void readCharacteristic(BluetoothGattCharacteristic characteristic) {
        if (mBluetoothAdapter == null || mBluetoothGatt == null) {
            Log.w(TAG, "BluetoothAdapter not initialized");
            return;
        }
        mBluetoothGatt.readCharacteristic(characteristic);
    }

    public void writeCharacteristic(BluetoothGattCharacteristic characteristic, String data) {
        if (mBluetoothAdapter == null || mBluetoothGatt == null) {
            Log.w(TAG, "BluetoothAdapter not initialized");
            return;
        }
        characteristic.setValue(data);
        mBluetoothGatt.writeCharacteristic(characteristic);
    }

    public void writeCharacteristic(BluetoothGattCharacteristic characteristic, byte[] data) {
        if (mBluetoothAdapter == null || mBluetoothGatt == null) {
            Log.w(TAG, "BluetoothAdapter not initialized");
            return;
        }
        //Log.i(TAG,"beginReliableWrite"+String.valueOf(mBluetoothGatt.beginReliableWrite()));
        characteristic.setValue(data);
        mBluetoothGatt.writeCharacteristic(characteristic);

    }

    /**
     * Enables or disables notification on a give characteristic.
     *
     * @param characteristic Characteristic to act on.
     * @param enabled        If true, enable notification.  False otherwise.
     */
    public void setCharacteristicNotification(BluetoothGattCharacteristic characteristic,
                                              boolean enabled) {
        if (mBluetoothAdapter == null || mBluetoothGatt == null) {
            Log.w(TAG, "BluetoothAdapter not initialized");
            return;
        }
        if (characteristic == null) {
            Log.i(TAG, "setCharacteristicNotification: characteristic is not exist!");
            return;
        }
        mBluetoothGatt.setCharacteristicNotification(characteristic, enabled);

        List<BluetoothGattDescriptor> descriptors = characteristic.getDescriptors();
        for (BluetoothGattDescriptor dp : descriptors) {
            dp.setValue(BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE);
            mBluetoothGatt.writeDescriptor(dp);
        }
        // This is specific to Heart Rate Measurement.
//        if(TX_CHAR_UUID.equals(characteristic.getUuid())){
//            BluetoothGattDescriptor descriptor = characteristic.getDescriptor(
//                    UUID.fromString(CLIENT_CHARACTERISTIC_CONFIG));
//            descriptor.setValue(BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE);
//            mBluetoothGatt.writeDescriptor(descriptor);
//        }
    }

    /**
     * Retrieves a list of supported GATT services on the connected device. This should be
     * invoked only after {@code BluetoothGatt#discoverServices()} completes successfully.
     *
     * @return A {@code List} of supported services.
     */
    public List<BluetoothGattService> getSupportedGattServices() {
        if (mBluetoothGatt == null) return null;

        return mBluetoothGatt.getServices();
    }

    private BroadcastReceiver MyReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            String action = intent.getAction();
            String intentAction;
            HandleCommand cmd = HandleCommand.getHandleCommand(intent.getIntExtra(HandleCMD, 0));
            BluetoothGattCharacteristic characteristic;
            BluetoothGattService service;
            if (BluetoothLeService.ACTION_GATT_HANDLE.equals(action)) {
                switch (cmd) {
                    case NORDIC_BLE_CONNECT:
                        initialize();
                        String btaddr = intent.getStringExtra(HandleDeviceAddress);
                        connect(btaddr);
                        Log.i(TAG, "Broadcast connect.");
                        break;
                    case NORDIC_BLE_DISCONNECT:
                        disconnect();
                        Log.i(TAG, "Broadcast disconnect.");
                        break;
                    case NUS_WRITE_CHARACTERISTIC:
                        byte[] data = intent.getByteArrayExtra(HandleData);
                        Log.i(TAG, "nordic_ble_nus_write_characteristic");
                        if (mBluetoothAdapter == null || mBluetoothGatt == null) {
                            Log.w(TAG, "BluetoothAdapter not initialized");
                            intentAction = ACTION_GATT_CHARACTERISTIC_NOT_FOUND;
                            broadcastUpdate(intentAction);
                            break;
                        }
                        service = mBluetoothGatt.getService(NUS_SERVICE_UUID);
                        if (service == null) {
                            Log.i(TAG, "NUS service is not exist!");
                            intentAction = ACTION_GATT_CHARACTERISTIC_NOT_FOUND;
                            broadcastUpdate(intentAction);
                            break;
                        }
                        characteristic = service.getCharacteristic(RX_CHAR_UUID);
                        if (characteristic == null) {
                            intentAction = ACTION_GATT_CHARACTERISTIC_NOT_FOUND;
                            broadcastUpdate(intentAction);
                            break;
                        }
                        writeCharacteristic(characteristic, data);
                        break;
                    case NUS_TX_SET_NOTIFICATION:
                        Boolean notification = intent.getBooleanExtra(HandleData, false);
                        if (notification.equals(true)) {
                            Log.i(TAG, "nordic_ble_nus_tx_set_notification");
                        }
                        if (mBluetoothAdapter == null || mBluetoothGatt == null) {
                            Log.w(TAG, "BluetoothAdapter not initialized");
                            intentAction = ACTION_GATT_CHARACTERISTIC_NOT_FOUND;
                            broadcastUpdate(intentAction);
                            break;
                        }
                        service = mBluetoothGatt.getService(NUS_SERVICE_UUID);
                        if (service == null) {
                            Log.i(TAG, "NUS service is not exist!");
                            intentAction = ACTION_GATT_CHARACTERISTIC_NOT_FOUND;
                            broadcastUpdate(intentAction);
                            break;
                        }
                        characteristic = service.getCharacteristic(TX_CHAR_UUID);
                        if (characteristic == null) {
                            Log.i(TAG, "NUS characteristic is not exist!");
                            intentAction = ACTION_GATT_CHARACTERISTIC_NOT_FOUND;
                            broadcastUpdate(intentAction);
                            break;
                        }
                        setCharacteristicNotification(characteristic, notification);
                        intentAction = ACTION_NUS_INITIALIZED;
                        broadcastUpdate(intentAction);
//                        characteristic = mBluetoothGatt.getService(NUS_SERVICE_UUID).getCharacteristic(RX_CHAR_UUID);
//                        setCharacteristicNotification(characteristic, notification);
                        break;
                    default:
                        break;
                }
            }

        }
    };

    private static IntentFilter MyIntentFilter() {
        final IntentFilter intentFilter = new IntentFilter();
//        intentFilter.addAction(BluetoothLeService.ACTION_GATT_CONNECTED);
//        intentFilter.addAction(BluetoothLeService.ACTION_GATT_DISCONNECTED);
//        intentFilter.addAction(BluetoothLeService.ACTION_GATT_SERVICES_DISCOVERED);
//        intentFilter.addAction(BluetoothLeService.ACTION_DATA_AVAILABLE);
        intentFilter.addAction(BluetoothLeService.ACTION_GATT_HANDLE);
        return intentFilter;
    }
}
